<!doctype html>
<html lang="zh">
<head>
  <meta charset="UTF-8">
  <meta name="viewport"
        content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>测试</title>
</head>
<body>
<style id="demo2"></style>
<div id="demo"></div>
<div id="buttons">
  <button id="btnPause">暂停</button>
  <button id="btnPlay">播放</button>
  <button id="btnSlow">慢速</button>
  <button id="btnNormal">中速</button>
  <button id="btnFast">快速</button>
</div>
<style>
  * {box-sizing: border-box;}
  *::before, *::after {box-sizing: border-box;}
  #buttons {
    position: fixed;
    right: 0;
    top: 0;
    z-index: 10;
    display: flex;
    flex-direction: column;
    margin-top: 10px;
    margin-right: 10px;
  }
  #buttons > button {
    margin-bottom: 10px;
    padding: 4px 8px;
  }
  #demo2 {
    display: none;
  }
  #demo {
    position: fixed;
    height: 50vh;
    top: 0;
    left: 0;
    width: 100%;
    border: 1px solid black;
    overflow-y: auto;
  }
  #demo::-webkit-scrollbar {
    display: none;
  }
  #html {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 50vh;
  }
</style>
<div id="html">
  <div class="bk">
        <!-- 耳朵 -->
        <div class="ear left"></div>
        <div class="ear right"></div>


        <!-- 头 -->
        <div class="head"></div>

        <!-- 耳朵 -->
        <div class="eyes left"></div>
        <div class="eyes right"></div>

        <!-- 脸蛋 -->
        <div class="face left"></div>
        <div class="face right"></div>

        <!-- 鼻子 -->
        <div class="nose"></div>

        <!-- 嘴巴 -->
        <div class="mouse left"></div>
        <div class="mouse right"></div>
    </div>
</div>
    <script src="test.js"></script>
</body>
</html>